A method for improving the qualified rate of flaw detection of 14-30mm q345c steel plate
A pass rate, steel plate technology, applied in the manufacture of converters, etc., can solve the problems of low pass rate of flaw detection, high production cost, waste of raw materials, etc.
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[0027]A method for improving the qualified rate of flaw detection of 14-30mm Q345C steel plate, comprising Q345C steel plate and the production method of said Q345C steel plate; the chemical composition (unit, wt%) of said Q345C steel plate is: C: 0.15-0.18, Si: 0.20~0.40, Mn: 1.25~1.35, P: ≤0.025, S: ≤0.005, Ti: 0.015~0.025, Als: 0.015~0.030, others are Fe and residual elements.
[0028] The production method of described Q345C steel plate comprises the following steps: hot metal KR desulfurization, converter smelting, LF refining, continuous casting, billet sending and rolling;
[0029] Hot metal KR desulfurization: shallow desulfurization is adopted according to the S content of molten iron to ensure that the sulfur content of molten iron in converter smelting after desulfurization is ≤0.010%;
[0030] Converter smelting: C content at the end of the converter tapping ≥ 0.06%, to prevent over-oxidation of molten steel; tapping temperature ≥ 1650 ° C, to ensure that the tempe...
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